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Are you using the RealTek driver supplied by Intel (since you have an Intel motherboard) or are you using RealTek drivers from some other source? In my example, shown, I have a Gigabyte motherboard and using the Gigabyte supplied RealTek drivers.

A VGA cable is video and has nothing to do with audio. However, exactly how are you set up? Do you have the "Speakers" set as the default audio playback device?

It may still be the Intel, but download and install the version on the Intel link I provided and see what that does, if it changes anything. I used to have an Intel motherboard and the default configuration was that an analog (not USB) headphone muted the speakers.

Did this ever work correctly? If not, it may be the connection from the case front panel is either not installed correctly? Check the connection on the motherboard. Also, many cases have both HD Audio and AC97 audio connectors, and the HD Audio connector should be used. The HD Audio connection has some additional auto sensing capability (e.g. if a headset is connected).

I'm downloading the file. It may take some time.
I bought the computer several months ago and hadan't used the headphons up until a week ago.
My case is basic and I only have blue, green and pink ports.
As to the connection on the motherboard - I'm an amateur. :)

Those sound like the audio ports on the rear motherboard I/O panel. Blue - Line In, Green - Speaker and Pink - microphone input. Usually, on the front panel there is only a headphone and microphone ports. The cable runs from the case front panel to the motherboard's audio jack. Check the connection and see if it has the HD Audio connector connected. Power off the PC before opening the case and checking. The connector is "keyed" (one pin missing so it only goes on one way - properly).

Number 21 on the motherboard layout is the front panel audio connection.

I’ve installed the driver.
I had to reboot twice. Between the first and the second I right-clicked on the sound icon in the taskbar and the option ‘Headphones’ was on the list (some progress!).
After the second reboot that option disappeared again, and in RealTek 'Advanced Settings' I only get the second section (Recording Device).

As for opening the case – I’d rather do that later with a friend.

In the meantime, I’d be very grateful if you could think of another idea.

The default is "normally", the PC speakers (connected to the rear GREEN speaker jack) are cut off when the headset is connected to the front panel headphone jack. Next step would be to check the connector to the motherboard.

Mute Speakers when Headphones are connected

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long story short..
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Creative SB X-Fi: Speakers refuse to mute upon inserting headphones.As it stands right now, my Creative Soundblaster X-Fi Xtreme Audio Card will not allow me to plug in my headphones via the front panel of my desktop. (This makes sense, as the onboard audio solution was disabled upon installation of the card.)
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